data = load('output_change.txt');
y1_data = data(:)'; 
data = load('output_origin.txt');
y2_data = data(:)'; 
data = load('output_o.txt');
y3_data = data(:)'; 
x=linspace(0,2*pi,800);
figure
hold on
plot(x,y1_data(:),'r--','LineWidth', 3);
plot(x,y2_data(:),'b*');
plot(x,y3_data(:),'k-');
grid on
hold off
